As can be seen on the SPY IOIA screen below, JPM's ETF desk singlehandedly manages to push market higher. It is unknown if this is for prop positions (yes Senator Corker, we know it when we see it), or flow (JPM is RenTec's. and many other quant funds' Prime Dealer) is unknown. What is known is that JPM indicates every single SPY offer was lifted by its sage trader.